University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Two-neutron capture reactions and the r process

Bartlett, A, Gorres, J, Mathews, GJ, Otsuki, K, Wiescher, M, Frekers, D, Mengoni, A and Tostevin, J (2006) Two-neutron capture reactions and the r process PHYSICAL REVIEW C, 74 (1). ? - ?. ISSN 0556-2813

[img]
Preview
PDF
fulltext.pdf

Download (261Kb)

Abstract

Rates for the He-4(2n,gamma)He-6 and He-6(alpha,n)Be-9 reactions have been calculated, including both resonant and nonresonant contributions. The sequential two-neutron capture process on He-4 has also been reevaluated on the basis of new experimental results. It is shown that a one-step dineutron capture reaction may enhance the sequential two-neutron reaction rate by several orders of magnitude. This opens the possibility that reaction flow through He-4((2)n,gamma)He-6(alpha,n)Be-9 may occur in competition with the bottle-neck three-body reactions He-4(2 alpha,gamma)C-12 and the He-4(alpha n,gamma)Be-9 that initiate the alpha process and provide seed nuclei for the r process. Here we explore the effect of such dineutron capture on r-process nucleosynthesis. We show that such reactions have little effect on the final abundance and would change only r-process abundances in an extremely neutron-rich low-temperature r process.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Nuclear, Physics, NEUTRINO-DRIVEN WINDS, PROCESS NUCLEOSYNTHESIS, ENERGY-LEVELS, STAR MERGERS, LIGHT-NUCLEI, SUPERNOVA EXPLOSIONS, ALPHA-PROCESS, COLLAPSE, DENSITY, MATTER
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:09
Last Modified: 23 Sep 2013 18:28
URI: http://epubs.surrey.ac.uk/id/eprint/450

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800